Alert archive / New York / Tornado Watches in 2020
Tornado Watch 455
The Storm Prediction Center issued this tornado watch at Aug 27, 2020, 1:22 PM EDT for Northwest Hills Planning Region, Connecticut; 12 counties in New York; Pike County, Susquehanna County, Wayne County, Pennsylvania. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 27, 2020, 1:22 PM EDT (17:22 UTC)
- Expired
- Aug 27, 2020, 7:57 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
Counties Northwest Hills Planning Region, CT, Broome County, NY, Chenango County, NY, Columbia County, NY, Cortland County, NY, Delaware County, NY, Dutchess County, NY, Greene County, NY, Otsego County, NY, Sullivan County, NY, Tioga County, NY, Tompkins County, NY, Ulster County, NY, Pike County, PA, Susquehanna County, PA, Wayne County, PA
The radar
The Binghamton radar (KBGM), 66 km from the middle of the area, began a volume at 17:25 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 50%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 50%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
24 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 1:42 PM EDT | Tornado Warning | BGM | Delaware | 33 min |
| Aug 27, 1:44 PM EDT | Severe Thunderstorm Warning | BGM | Chenango, Cortland | 46 min |
| Aug 27, 1:50 PM EDT | Severe Thunderstorm Warning | ALY | Columbia, Greene, Schoharie, Ulster | 40 min |
| Aug 27, 2:05 PM EDT | Tornado Warning | ALY | Greene, Ulster | 40 min |
| Aug 27, 2:13 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Chenango, Cortland, Tompkins | 47 min |
| Aug 27, 2:26 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Chenango, Delaware | 49 min |
| Aug 27, 2:31 PM EDT | Severe Thunderstorm Warning | ALY | Columbia, Dutchess, Greene, Ulster | 44 min |
| Aug 27, 2:48 PM EDT | Tornado Warning | ALY | Northwest Hills Planning Region | 27 min |
| Aug 27, 2:56 PM EDT | Tornado Warning | ALY | Dutchess, Ulster | 21 min |
| Aug 27, 2:59 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Chenango, Delaware | 46 min |
| Aug 27, 3:09 PM EDT | Tornado Warning | ALY | Northwest Hills Planning Region | 51 min |
| Aug 27, 3:10 PM EDT | Severe Thunderstorm Warning | BGM | Delaware, Sullivan | 65 min |
| Aug 27, 3:14 PM EDT | Tornado Warning | ALY | Dutchess | 31 min |
| Aug 27, 3:40 PM EDT | Severe Thunderstorm Warning | ALY | Northwest Hills Planning Region | 32 min |
| Aug 27, 3:46 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Cortland, Tioga, Tompkins | 29 min |
| Aug 27, 3:46 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Delaware, Sullivan | 59 min |
| Aug 27, 4:11 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Chenango, Cortland, Tioga | 49 min |
| Aug 27, 4:21 PM EDT | Severe Thunderstorm Warning | BGM | Sullivan | 24 min |
| Aug 27, 4:30 PM EDT | Severe Thunderstorm Warning | BGM | Chemung, Schuyler, Tioga, Tompkins | 45 min |
| Aug 27, 4:52 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Tioga | 38 min |
| Aug 27, 4:56 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Chenango, Delaware, Sullivan | 64 min |
| Aug 27, 5:23 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Delaware, Sullivan | 37 min |
| Aug 27, 5:50 PM EDT | Severe Thunderstorm Warning | BGM | Delaware, Sullivan | 55 min |
| Aug 27, 6:29 PM EDT | Severe Thunderstorm Warning | ALY | Dutchess | 31 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 5.4 hours before the alert went out and 120 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 756 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 223 m²/s²
- 0-3 km storm-relative helicity
- 214 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 12:38 PM EDT | Mesoscale Discussion | SPC | 3 hr | |
| Aug 27, 2:59 PM EDT | Mesoscale Discussion | SPC | 61 min | |
| Aug 27, 3:19 PM EDT | Tornado Watch | SPC | Greater Bridgeport Planning Region, Capitol Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region | 5 hr |
| Aug 27, 9:41 AM EDT | Mesoscale Discussion | SPC | Delaware, Dutchess, Putnam, Ulster | 94 min |
| Aug 27, 2:49 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Cattaraugus, Cayuga, Chautauqua, Chemung, Erie and 8 more | 5 hr |
| Aug 27, 6:35 PM EDT | Mesoscale Discussion | SPC | Bronx, Kings, Nassau, New York, Queens, Richmond and 1 more | 115 min |
| Aug 27, 2:14 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Cambria, Cumberland, Fayette and 6 more | 2 hr |
| Aug 27, 4:34 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 9 more | 86 min |
| Aug 27, 5:32 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 28 more | 4 hr |
Nearby
Tornado Watches in New York, 2020Tornado Watches in Pennsylvania, 2020Tornado Watches in Connecticut, 2020Every tornado watch in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.